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This paper describes the open loop configuration of the simulation and measurement of a controller hardware and a voice coil actuator for vibration control of a 11 kW motor on steel frame foundation. The paper discusses the phase response regarding damping behavior of the actuator force and identifies approaches for improvements. Further, the paper offers a comparison of measurements as a result of the run up of the motor in open loop and closed loop operation with rubber elements and with steel springs. It is shown that all vibration modes with vertical movement at the motor feet can be reduced. Finally, the paper discusses the change in the system’s natural frequencies due to the replacement of the rubber elements by steel springs.
This paper describes the vibration behaviour of a small 11 kW two pole induction motor, which is mounted on an elastic steel frame foundation with an active vibration control system (AVCS). On the one hand the paper presents detailed 3D finite element models for vibration analysis and compares the vibration simulation results to vibration measurement results and on the other hand, the paper presents a comparison of different settings of the test bench-motor mounted directly on the steel frame foundation and motor mounted on the developed AVCS. Further, the comparison of experimental modal analyses with open and close control loop operation are shown to demonstrate the efficiency of the AVCS. Finally, the paper gives an outlook about the scaling of the AVCS for motors in the megawatt range.
Preventing vibrations in electrical motors that are mounted on elastic foundations could help to open up operating speed ranges in which it was previously not allowed to operate as a permanent operating point. In the present paper, theoretical and practical aspects of an active vibration control of a two-pole induction motor (11 kW) mounted on a drive system and an elastic steel frame foundation are investigated. In preparation for simulating state space models with more degrees of freedom, a theoretical analysis derived from the existing test bench reduced to a two-mass-oscillator - motor, actuator and foundation - is done, to show which components are essential. Based on this analysis, simulations with a state space model and modified integral control algorithms will be discussed – in open and closed loop. Results of simulations of vibration reduction
due to the control algorithm and disturbance response will be compared to experimental results from the test bench. Additionally, the power consumption of an actuator is analysed.
This paper describes the vibration behaviour of a small (11 kW) two pole induction motor, which is mounted on an elastic steel frame foundation with a special actuator system. This paper presents natural frequencies as a result of experimental model analysis of the whole system – motor, actuator system and steel frame foundation – and compares them to the numerical modal analyses using a finite element model. Additionally, forced vibrations are measured using the actuators as a shaker to de rive the resonance frequencies of the system. The measured natural frequencies by modal analysis, the measured resonance frequencies and the simulated natural fre quencies are compared to each other. Additionally, the necessary electrical power of the electrodynamic actuators is analysed.
